Which indeed is the least of all seeds: but when it is grown, it is the greatest among herbs, and becomes a tree, so that the birds of the air come and lodge in the branches thereof.
All Commentaries on Matthew 13:32 Go To Matthew 13
Gregory The Dialogist
AD 604
Mor., xix, 1: Christ Himself is the grain of mustard seed, who, planted in the garden of the sepulchre, grew up a great tree; He was a grain of seed when Hedied, and a tree when He rose again; a grain of seed in the humiliation of the flesh, a tree in the power of His majesty.
“The birds lodge in its branches,” when holy souls that raise themselves aloft from thoughts of earth on the wings of the virtues, breathe again from the troubles of this life in their words and comfortings.